﻿172 Vail: Studies in the Asclepiadaceae 



nate, coriaceous ; margins revolute and twisted when dry : pedun- 

 cles terminal, solitary or two, 4-10-flowered, 2-5 cm. long ; pedi- 

 cels 1.5 cm. long, filiform: corolla-segments oblong-lanceolate, 

 acutish, 5 mm. long, dull purplish, or ash-colored, scarious mar- 

 gined ; column distinct ; hoods whitish, tinged with pink, about 2 

 mm. high, not exceeding the anthers, 5 -dentate at the apex ; cen- 

 tral tooth and the two ventral infolded and acute intermediate ones 

 rounded ; horn arising from the base of the hood and leaving the 

 middle tooth of the hood free ; anther- wings small, salient and 

 angled at the somewhat rounded base, or possibly obscurely 

 notched : follicles erect on deflexed pedicels. Mature fruit not 

 seen. 



San Luis Potosi, Mexico, Parry & Palmer, no. 583, 1878. 



Clearly a distinct species and "very closely related to both A. 

 quinqucdentata and A. Schaffneri and seemingly intermediate be- 

 tween them. The leaves are, however, much shorter, there are 

 fewer of them, and they are cinereous tomentulose with short, 

 twisted, whitish hairs. 



I have just received from Miss Alice Eastwood, the following 

 description of an interesting Asclepias from Utah : 



Asclepias macrosperma Eastwood. 



Ase/ep, 



Zoe., 4 : 129. 



1893. N ot Asclepias foment osa Ell. 1 8 1 7 . 



Stems several from a woody, horizontal rootstock, slender, 

 decumbent, 6 cm. to 3 dm. long, tomentulose, angled. Leaves 

 alternate, close together or scattered, 1-7 cm. long, 6 mm. to 2 cm. 

 wide ; blades lanceolate, ovate-lanceolate and the lowest orbicular ; 

 base subcordate, truncate or obtuse ; apex acuminate ; margin un- 

 dulate, densely tomentulose ; upper surface of leaves glabrous ex- 

 cept for a few hairs on the veins, wrinkled; lower prominently 

 veined, tomentulose : umbels one or two, terminal and lateral, 

 closely sessile, many-flowered, with involucral leaves : pedicels 



about 1 cm. long, filiform, tomentulose : calyx-segments ovate- 



acuminate, 2y 2 mm. long, glabrous above, tomentulose below; 



membran 



ously margined, with a notch in the margin and the solid portion 

 of the leaf acute, thickened, rugulose and purplish below, puberu- 

 lent and greenish above ; column short but distinct ; hoods erect, 

 scarcely exceeding the anthers, rounded at the subtruncate sum- 

 mit, the ventral margins convolute ; horn falcate, subulate, inflexed, 

 slightly exserted over the anthers : anther-wings salient below the 



